| 摘要 |
1512994 Keyboards with coded outputs MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 5 May 1975 [20 May 1974] 18678/75 Heading G4H [Also in Division H3] A keyboard 1 is connected with circuitry 5 which is such that a single-digit number, e.g. six, need only be entered as "6" rather than "06". The keyboard forms part of accessing circuitry 1-7 for the memory 16 of a channelselector for a voltage controlled tuner 18 (see Division H3). A first-selected digit passes via diode matrix 2 to a store 3 in which it is entered by a LOAD-1 signal d<SP>1</SP> form a monostable 5-1, at the same time, a CLEAR output l from a NAND gate and differentiator, connected to monostables 5-2, 5-3 clears a second store 4. If a second digit is selected during the unstable period of monostable 5-3 (i.e. if there is a pulse f from 5-2 while the output i of 5-3 is high), a LOAD-2 signal m<SP>1</SP> from a second NAND gate and differentiator enters the contents of store 3 in store 4, whereafter a second LOAD-1 signal d<SP>11</SP> enters the second digit in store 3. The contents of stores 3, 4 may be displayed at 8. |
